Contact roller in a sanding device

ABSTRACT

In a sanding device, a contact roller is steel material having grooves provided at an equal pitch and at an angle in relation to a longitudinal axis of the contact roller on an outer peripheral surface thereof and each having a larger width at a bottom portion thereof in comparison with that of a top portion; and pressure elements fitted displaceably into said grooves for applying pressure to a material to be processed in contact with a belt sander mounted thereon.

United States Patent Hasegawa 1 June 13, 1972 CONTACT ROLLER IN ASANDING [56] References Cited DEVICE UNITED STATES PATENTS 2] Inventor:Katsuji a Nagoya City, Japan 304,253 8/1884 Belknap ..29/121 [73]Assignee: Kabushiki Kalsha Meinan Seisakusho, 1,618,704 2/1927 GfupeNagoya City, Japan 2,850,853 9/1958 Simendinger ..29/l2l X [22] Filed:Sept 1970 Primary Examiner-Leon G. Machlin [2]] App]. 72,137 A!t0rneyB.Edward Shlesinger Related 0.8. Application Data 7 ABSTRACT [63]Continuafion of Sept- 1968' In a sanding device, a contact roller issteel material having abandonedgrooves provided at an equal pitch and atan angle in relation to a longitudinal axis of the contact roller on anouter g 'g peripheral surface thereof and each having a larger width ata n. a a t u bottom portion thereof in comparison that o a op p [58]Field ofSearch ..29/127, 128, I21, 121 H; d l I bl 51/141 tion, anpressure e ements med disp acea y mto sat grooves for applying pressureto a material to be processed in contact with a belt sander mountedthereon.

1 Claim, 2 Drawing Figures CONTACT ROLLER IN A SANDING DEVICE Thisapplication is a continuation of Ser. No. 757,278, filed Sept. 4, 1968,now abandoned.

The present invention relates to a contact roller in a sanding device.

A principal object of the present invention is to provide a contactroller of simple structure having plural strips of pressure elementsfitted displaceably thereinto depending upon a material to be processed.

A further object of the present invention is to provide a contact rollerin a sanding device, which can not only achieve double belt sanding withimproved performance but also perform versatile sanding on one sandingdevice.

In the accompanying drawings a preferred embodiment of a contact rolleraccording to the present invention is shown, wherein,

FIG. 1 is a front view of such a contact roller, and

FIG. 2 is an enlarged sectional view taken along the line H II of FIG.1, showing the fitting of strips of the pressure elements.

R is a contact roller of a steel material having a shaft 1 and spiralgrooves 2 provided at an equal pitch on the outer surface of the roller.Each groove 2 runs spirally at an angle of 45 in relation to the shaft1, and has a bottom width larger than a top width. Into each of saidgrooves 2, a strip of pressure element P is fitted, inserted in a mannerto project partly out of its groove 2. The strip of pressure element Pmay be formed of, for example, wear-resistant rubber.

The major disadvantage of the conventional rubber contact roller lies inthe difficulty of using wear-resistant rubber to fit into grooves in theroller because of the trouble of cutting such rubber to fit the ordinarygrooves. Another disadvantage in the conventional contact roller lies indifficulty in replacement; it is practically difficult to select acontact roller having an appropriate hardness according to a material tobe processed. If uneven abrasion takes place on the surface of thecontact roller, grinding on the worn surface has been the only possiblerepair work, from the view points of economy and structure. Grinding ofthe worn surface of the contact roller, however, results in diametricalreduction of the roller on every occasion. Diametrical irregularity ofrollers caused from repair grinding is seriously inconvenient in a twobelt sanding device wherein sanding process is performed simultaneouslyat two portions, since it causes irregularity in the sanding surface ofthe belt, resulting to either lack of uniformity or impossibility ofgrinding work. Repair grinding of the roller is unfavorable in a morethan two belt sanding device from the view-points of precision ofperformance and handling. Further disadvantage in the conventionalcontact roller lies in a higher cost-price, since consumption ofexpensive rubber is larger.

The grooved contact roller of the present invention overcomes thesedefects and disadvantages. That is, pressure elements P which are fittedinto grooves of the roller surface, may be formed of wear-resistantrubber. Pressure elements may be replaced without causing any trouble asthe contact roller is kept mounted on the sanding device, so thatgrinding according to a material to be processed can be efficientlyachieved by selecting the configuration and hardness of pressureelements. Consumption of expensive rubber is greatly reduced, whichcontributes to reduction of cost price of the contact roller. Wornpressure elements may be replaced economically. Therefore, the groovedcontact roller having replaceable pressure elements provides efiicientperfonnance when it is used in the more than two belts sanding device.

The contact roller according to the present invention, when mounted on asanding device, performs versatile sanding with greatly improvedefficiency.

Having thus described my invention, what I claim is:

1. A contact roller for applying pressure to a material to be processedin contact with a belt sander,

said contact roller being a steel metal roller having a width of atleast mm and a plurality of equiangularly spaced,longitudinally-extending helical grooves arranged around its periphery,and inclined to its ongitudinal axis at an angle of 30 to 60, eachgroove having straight sides in cross-section and being of slightlylarger width at its bottom than at its top, and

a wear-resistant resilient rubber pressure element fitted displaceablyin each groove,

each groove having a depth of at least half but less than the fullheight of said pressure elements,

all said pressure elements projecting outwardly beyond the periphery ofsaid metal roller and being spaced'from one another circumferentially ofsaid metal roller,

each pressure element being curved helically longitudinally about saidaxis, and

adjacent pressure elements overlapping longitudinally of said axis.

1. A contact roller for applying pressure to a material to be processedin contact with a belt sander, said contact roller being a steel metalroller having a width of at least 150 mm and a plurality ofequiangularly spaced, longitudinally-extending helical grooves arrangedaround its periphery, and inclined to its longitudinal axis at an angleof 30* to 60*, each groove having straight sides in cross-section andbeing of slightly larger width at its bottom than at its top, and awear-resistant resilient rubber pressure element fitted displaceably ineach groove, each groove having a depth of at least half but less thanthe full height of said pressure elements, all said pressure elementsprojecting outwardly beyond the periphery of said metal roller and beingspaced from one another circumferentially of said metal roller, eachpressure element being curved helically longitudinally about said axis,and adjacent pressure elements overlapping longitudinally of said axis.